C# 下载文件 删除文件 写入文本

由于经常用到文件处理，便自己封装了下 分享给大家。 包含写入文本  批量删除文件  下载文件 。--可直接使用 /// /// 写入到txt /// /// /// public static void WriteInTxt(string savePath, string content) { string tempPath = System.IO.Path.GetDirectoryName(savePath); System.IO.Directory.CreateDirectory(tempPath); //创建临时文件目录 if (!System.IO.File.Exists(savePath)) { FileStream fs1 = new FileStream(savePath, FileMode.Create, FileAccess.Write);//创建写入文件 StreamWriter sw = new StreamWriter(fs1); sw.WriteLine(content);//开始写入值 sw.Close(); fs1.Close(); } else { FileStream fs = new FileStream(savePath, FileMode.Open, FileAccess.Write); StreamWriter sr = new StreamWriter(fs); sr.WriteLine(content);//开始写入值 sr.Close(); fs.Close(); } } /// /// 递归删除文件夹下所有文件 /// /// public static void DeleteFile(string dirPath) { try { //去除文件夹和子文件的只读属性 //去除文件夹的只读属性 System.IO.DirectoryInfo fileInfo = new DirectoryInfo(dirPath); fileInfo.Attributes = FileAttributes.Normal & FileAttributes.Directory; //去除文件的只读属性 System.IO.File.SetAttributes(dirPath, System.IO.FileAttributes.Normal); //判断文件夹是否还存在 if (Directory.Exists(dirPath)) { foreach (string f in Directory.GetFileSystemEntries(dirPath)) { if (File.Exists(f)) { //如果有子文件删除文件 File.Delete(f); } else { //循环递归删除子文件夹 DeleteFile(f); } } //删除空文件夹 Directory.Delete(dirPath); } } catch (Exception e) { } } /// /// Http下载文件 /// /// 下载文件路径 /// 保存路径 /// public static bool HttpDownloadFile(string url, string savePath) { string tempPath = System.IO.Path.GetDirectoryName(savePath); System.IO.Directory.CreateDirectory(tempPath); //创建临时文件目录 string tempFile = tempPath + @"\" + System.IO.Path.GetFileName(savePath); //临时文件 if (System.IO.File.Exists(tempFile)) { //存在则跳出 return true; //System.IO.File.Delete(tempFile); } try { FileStream fs = new FileStream(tempFile, FileMode.Append, FileAccess.Write, FileShare.ReadWrite); // 设置参数 HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest; //发送请求并获取相应回应数据 HttpWebResponse response = request.GetResponse() as HttpWebResponse; //直到request.GetResponse()程序才开始向目标网页发送Post请求 Stream responseStream = response.GetResponseStream(); //创建本地文件写入流 //Stream stream = new FileStream(tempFile, FileMode.Create); byte[] bArr = new byte[1024]; int size = responseStream.Read(bArr, 0, (int)bArr.Length); while (size > 0) { //stream.Write(bArr, 0, size); fs.Write(bArr, 0, size); size = responseStream.Read(bArr, 0, (int)bArr.Length); } //stream.Close(); fs.Close(); responseStream.Close(); System.IO.File.Move(tempFile, savePath); return true; } catch (Exception ex) { return false; } }